Improved mechanism for converting motion



dinard. gft-atta .utenti (attire.

ELIJAH S. PlERCE, OF HARTFORD, CONNECTICUT, ASSl-GNOR TO THE NATIONAL SCREW COMPANY, OF SAME PLACE.

Lette/rs Patent No. 92,091, dated J une 29, 1869.

IMPROVED MECHANISM FOR CONVERTING- MOTION.

The Schedule referred toin these Letters-Patent and making part of 'the same.

To all whom fit may concern Be it known that I, ELIJAH S. France, of Hartford, in the county of Hartford, and State of Connecticut,have invented a new and' useful Improvement in Mechanisms for Converting Continuous into Intermittent Motion; and I declare the following to be a full and exact description thereof, reference being had to the accompanying drawings, and to the letters of reference marked thereon, thrilling a part of this specification.

Figure l is a side elevation of my device.

, Figure 2 is an end elevation. The same letters always indicate the same parts. As is wellknown to machinists, it is often desirable to convert continuons into intermittent motion, and to do this so that the stoppage in the intermittent motion shall always take place at some desired rprecise point.

It is often, in such cases. equally desirable that the 'intermittent motion should commence and close gently, so to avoid sudden jars in the machinery.

My invention isdesigned to accomplish the precise stoppage of the intermittent motion; anl to make the vconmiencement and close of the intermittent motion slow and gentle, and more rapid i1 its middle stage.

The letter A designates the frame of the device, containing the twoshafts a and b.

On the shaft b is the cam c, which, at the proper moment, drives down the sliding pin d, which, in its turn, pushes down the short arm e, which is fastened to the shaft g, to the other end of which the pawl h is fastened.

When the short arm e is pushed down, the pawl h is rotated back out of that one of the notches t', in the index-wheel G, which it may occupy at that mo` meut.

The letter D designates the drive-wheel, to the shaft of which the driving-power is applied.

From the inner face of this drive-wheel a pin,k, projects. v

As the drivewheel rotates, (in theA direction indicated by the arrow,) this pin k will strike upon the arms l l* l* li l* in succession, which are all a part of the armed wheel L, and rotate them and the armed wheel.

This armed wheel is loose upon the shaft'a. It fits up tight against the index-wheel C, which is fast upon the shaft a.

To that side of this index-wheel which is next the armed wheel L, are rigidly aflxed two pins, m and a.

The pin a tits loosely into a round hole in the armed wheel, so as to allow a little play of the armed wheel upon it. As the-armed wheel revolves, it :will carry the index-wheel C with it, but will allowa little play.

Now, to show one of the essential elements of my invention.

To one side of the arm l* is afhxed the spring s, which hears, at its loose end, against the pin m. This spring is made strong enough to rotate the indexwheel C, and whatever mechanism may be attached to its shaft a.

The pin lc, upon the drive-wheel D, is so placed, with reference to the armed wheel L, that each time it impinges upon one of the arms l Z l" L3 l, it will rotate the armed wheel L a trifle tiu'ther each time than is necessary to bring,r one of the notches t' around so that the pawl h will catch into it. v

This excess of motion is taken up, and absorbed on the spring s; and thus it is brought about, that when the parts become worn more or less, the armed wheel L will always strive to carry the notches t' past the pawl lt, thus insuring that the notches shall be always bronght'sqnarely up for the pawl to snap into.' l

It must, of course, be understood that the-mechanism which operates the pawl l will allow it to snap promptly into one of the notches t' when it comes t0. the proper point.

To insure this, in my device, a spiral spring, o, is arranged upon the shaft g, which constantly presses the pawl lt forward; and as it rests against the inside of the index-wheel, after it has been operated backward out of one of the notches i, by means of the mechanism hereinheforel described,- it will snap into the next notch as soon as presented.

There is another important advantage gained by my mechanism. By means of the peculiar shape given to the arms H* l" l l, when the pin'lt commences to impinge upon one of them, it will make the line of contact but a little more abrupt than a radial line extending from the first point of contact to the centre of the armed wheel. Y

The e'ect of this arrangement is to make the mo-l tion of the armed wheel very slow at its commencement, and close and rapid in its middle stage, which i's a great advantage in, most kinds of mechanism where intermittent mot-ion is used.

In the mechanism above described, continuous rotary motion is converted into intermittent rotary m0- tion.

My improvement is applicable when continuous rotary motion is converted into intermittent straight-lille motion, and tvice versa; and, in some cases, when continuons straight-line motion is converted into intermittent straight-line motion, the shape of the parts being adapted to the oice required of them. iAnd in the patent applied for herewith, it is intended to cover these adaptations of myjnvention.

4. The combination of the shaft: b, cam c, drive- Wheel D, drive-pin 7.', sliding-pin d, short :um e, shaft g, puwl 7l, spring o, armed wheel L, spring s, pins ne and n, index-wheel C, and shaft ai, :ill constructed, arranged, and operating as and for the, purposes described.

Dated April 17, lSGi).

ELIJAH PIERCE.

Witnesses z L. H AFELIN, W. E. Suroxns. 

